Back rest



FIG. 1 is a perspecive view which is taken from the front, top and rightside of the first embodiment of the back rest showing my new design;

FIG. 2 is a left side elevational view thereof, the right side viewbeing a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view which is taken from the front, top andright side of the second embodiment of the back rest showing my newdesign;

FIG. 8 is a left side elevational view thereof, the right side viewbeing a mirror image thereof;

FIG. 9 is a back elevational view thereof; and,

FIG. 10 is a bottom plan view thereof.

The ornamental design for a back rest, as shown and described.